4K, 2M ("large page"), or 1G ("huge page") on x86-64. A single allocation request can consist of multiple page sizes. From Windows Internal 7th Edt Part 1:

    On Windows 10 version 1607 x64 and Server 2016 systems, large pages may also be mapped with huge pages, which are 1 GB in size. This is done automatically if the allocation size requested is larger than 1 GB, but it does not have to be a multiple of 1 GB. For example, an allocation of 1040 MB would result in using one huge page (1024 MB) plus 8 “normal” large pages (16 MB divided by 2 MB).